Heney schwaezwaldee



(ModeL) H. SCHWARZWALDER.

NUT LOOK.

7 No. 288,263, Patented Nov. 13, 1883.

NITED STATES PATENT OFFICE}.

HENRY SOHYVARZWALDEB, OF NEW YORK, N. Y.

NUT- LOC K.

SPECIFICATION formingpart of Letters Patent No. 288,263, dated November 13,1883.

Application filed September 20, 1883. (Model.)

I0 all whom it may concern:

Be it known that I, HENRY SOHWARZWAL- DER, a resident of the city of New York, in the county and State of New York, have invented an Improyed Nut-Lock, of which the following is a fnll, clear, and exact descrip tion, reference being made to the accompany ing drawings, in which- Figure 1 is a plan or top view of my improved nut-lock. Fig. 2 is a side view of the same, and Fig. 3 a central section thereof.

This invention relates to means for preventing nuts from working themselves loose on bolts or screws, Whether used in vehiclessuoh as railroad-cars-or on stationary contrivancc'as-such as railroad-railsor in other places.

The invention consistsin slitting the thread ed end of the bolt, and in combining there-- with'anut and a washer which carries a yoke that enters the slit in the end of the bolt, all as hereinafter more fully described.

In the drawings, the letter A represents a bolt or screw, and B is the nut, which is threaded to fit said bolt or screw. 0 is a washer or plate, having a yoke-like top piece, D.

The upper or threaded end of thebolt or screw A has alongitudinal slot, (1, cut into it, into which the central portion of the yoke D enters when the device is in use. The nut will be between the body 0 of the washer and the yoke D'when the parts are properly on the .bolt. In screwing the nut home it crowds the washer along with it, and therefore draws the yoke D farther down into the slot a of the of which is that the yoke, acting'as a wedge,

end of the bolt, as is shown in Fig. 3. In this position it will be impossible for the nut to become jarred loose, as it cannot ride up on the expanded thread of the spread bolt, and the yoke at the same time is held fast in the jaws of said spread bolt. A very strong wrench and great power will be needed to start the nut B on its backward motion, and as it is started the person who does it will have to take care to cause the washer G to follow it, so as thus gradually to move the yoke 1) out of the slot and get the bolt A back into normal cylindrical form by the operation of unscrewing the nut.

The yoke D may either be of the form shown in Fig. 2, or may be a projection on or attachment of the washer G, of any other form, provided it is adapted to enter the slit in the bolt while the nut is between the said entering portion and the body of the washer. Where the yoke or its equivalent enters into the slot a. it may either be of rectangular form, as shown in Fig. 3, in which case the slot may be tapering,

or it may be wedge-like, in which case the slot may have parallel sides.

I claimg The combination of the nut 13 with the travcling washer O, yoke I), and bolt A, having slit a, substantially as described.

HENRY SOHWARZWALDER. l/Vitnesses:

TnoMl-is J. BURDY, Cans. F. BAUERDORF. 

